A study of impurity-free vacancy disordering in GaAs-AlGaAs for improved modeling

Helmy, A. S., Johnson, N.P., Ke, M.L., Bryce, A. C., Aitchison, J. S., Marsh, J. H. , Gontijo, I., Buller, G. S., Davidson, J. and Dawson, P. (1998) A study of impurity-free vacancy disordering in GaAs-AlGaAs for improved modeling. IEEE Journal of Selected Topics in Quantum Electronics, 4(4), pp. 661-668. (doi: 10.1109/2944.720477)

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Abstract

A study of the parameters of the process of impurity-free vacancy disordering (IFVD) of GaAs-AlGaAs quantum-well structures is presented. The study includes photoluminescence excitation measurements which show that the as-grown barrier/well interface is better fitted by an exponential profile than a square profile. This has a significant effect on the intermixed diffusion profiles. Also, deep level transient spectroscopy measurements have been conducted on samples that were processed using IFVD. The measurements show an elevated concentration of the trap EL2 in the processed samples, which is known to be related to As antisites. The concentration of such defects agrees with the concentration calculated for IFVD to within an order of magnitude, suggesting a correlation between the point defects required for IFVD and EL2. Finally, temporally and spatially resolved photoluminescence measurements were conducted on processed samples which indicate a factor of 3 reduction in the photogenerated carrier life time after undergoing IFVD. A spatial resolution better than 3 /spl mu/m has been observed.

Item Type:Articles
Additional Information:The work of A. S. Helmy was supported by the Faculty of Engineering at the University of Glasgow and by the ORS award scheme in the U.K. This work was supported by the Engineering and Physical Sciences Research Council and the Ministry of Defence under Grant GR/K45968 and by the Engineering and Physical Sciences Research Council under Grant GR/L75467.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Marsh, Professor John
Authors: Helmy, A. S., Johnson, N.P., Ke, M.L., Bryce, A. C., Aitchison, J. S., Marsh, J. H., Gontijo, I., Buller, G. S., Davidson, J., and Dawson, P.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Journal of Selected Topics in Quantum Electronics
Publisher:Institute of Electrical and Electronics Engineers
ISSN:1077-260X
ISSN (Online):1558-4542

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